REMOVAL AND INSTALLATION

caution

*Remove and assemble the marked parts in each cylinder unit.

Pre-removal Operation

Air Intake Hose Assembly Removal (Refer to GROUP 15 - Air Cleaner ).

Post-installation Operation

Air Intake Hose Assembly Installation (Refer to GROUP 15 - Air Cleaner ).

			Removal steps
		1.	Breather hose connection
		2.	PCV hose connection
		·	Ignition coil (Refer to GROUP 16 - Ignition system, Ignition Coil ).
		3.	Timing belt front upper cover
		4.	Engine hanger
		5.	Rocker cover assembly
<<A>>	>>D<<	6.	Rocker arm and shaft assembly
<<B>>	>>C<<	7.	Valve spring retainer lock
		8	Valve spring retainer
	>>B<<	9.	Valve spring
	>>A<<	10.	Valve stem seal
		11.	Valve spring seat

REMOVAL SERVICE POINTS

<<A>> ROCKER ARM AND SHAFT ASSEMBLY REMOVAL

caution

Never disassemble the rocker arm, shaft and lash adjuster assembly.

Before rocker arm and shaft assembly removal, install special tool lash adjuster holder (MD998443) as shown in the illustration so that the lash adjusters will not fall out.

<<B>> VALVE SPRING RETAINER LOCK REMOVAL

caution

When removing valve spring retainer lock, leave the piston of each cylinder in the TDC (Top Dead Centre) position. The valve may fall into the cylinder if the piston is not properly in the TDC position.

Use special tool valve spring compressor (MD998772) to compress the valve spring, remove the valve spring retainer lock.

INSTALLATION SERVICE POINTS

>>A<< VALVE STEM SEAL INSTALLATION

1.Apply a small amount of engine oil to the valve stem seal.

caution

Valve stem seals cannot be reused.
The special tool valve stem seal installer (MB991999) must be used to install the valve stem seal. Improper installation could result in oil leaking past the valve guide.

Use special tool (MB991999) to fill a new valve stem seal in the valve guide using the valve stem area as a guide.

>>B<< VALVE SPRINGS INSTALLATION

Install the valve springs with its identification colour painted end facing the locker arm.

>>C<< VALVE SPRING RETAINER LOCKS INSTALLATION

Use special tool valve spring compressor (MD998772) to compress the valve spring in the same manner as removal, install the valve spring retainer lock.

>>D<< ROCKER ARM AND SHAFT ASSEMBLY INSTALLATION

1.Ensure that all rocker arms do not press against the valve, then pre-tighten the rocker arm, shaft and lash adjuster assembly with the assembling bolt.

2.Check that notches in the each rocker shaft are facing the direction shown in the illustration.

3.Install the rocker shaft spring so that it is at a right angle against the spark plug guide.
4.Tighten the mounting bolts to the specified torque.
Tightening torque: 31 ± 3 N·m

5.Remove special tool lash adjuster holder (MD998443).